Re: Detecting down node with SolrJ
On 9/9/2016 10:11 PM, Shawn Heisey wrote: > On 9/9/2016 4:38 PM, Brent wrote: >> Is there a way to tell whether or not a node at a specific address is >> up using a SolrJ API? > Based on your other questions, I think you're running cloud. If that > assumption is correct, use the Collections API with HttpSolrClient > (instead of CloudSolrClient) to get a list of collections. Using > HttpSolrClient will direct the request to that specific server. If it > doesn't throw an exception, it's up. Here's some SolrJ code. After reading a reply on a separate thread, I was reminded of the ping handler. That might seem like a good solution, but using the ping handler would require that your code knows about a specific core on the server, or that it knows the name of one of the SolrCloud collections. The collections admin request that I outlined previously will work without the code needing any knowledge of what the cloud contains, . SolrCloud can almost guarantee that any collection in the cloud will be accessible from any node in the cloud if that node is functional ... but if you want to extremely pedantic in your check, and you have a ping handler defined in the config for the collection, you could use that handler to make sure that the collection is functional as well as the node. To check that you can access a collection named "foo" from a specific node, start with the code that I sent previously, and replace the last two lines of code with these: SolrPing ping = new SolrPing().setActionPing(); ping.process(client, "foo"); The SolrPing object assumes the ping handler is named "/admin/ping". If you have a ping handler with a different name/path, you should be able to use the "setPath" method on the ping object to change it before doing the "process" method. Thanks, Shawn
Re: Detecting down node with SolrJ
If you use Zookeeper you'll be fine if (and only if) the node was shut down gracefully. In that case Zookeeper should be completely current. If someone just pulled the plug on a Solr node though, you'll have to wait until Zookeeper times out when pinging the Solr node, perhaps minutes. If you do use Zookeeper, be sure you check "live_nodes" as the state.json for any particular collection may or may not be updated promptly. Best, Erick On Sat, Sep 10, 2016 at 8:03 AM, Rohit Kanchan <rohitkan2...@gmail.com> wrote: > I think it is better to use zookeeper data. Solr Cloud updates zookeeper > about node status. If you are using cloud then u can check zookeeper > cluster api and get status of node from there. Zookeeper cluster state api > can give you information about your Solr cloud. I hope this helps. > > Thanks > Rohit Kanchan > > > On Fri, Sep 9, 2016 at 3:38 PM, Brent <brent.pear...@gmail.com> wrote: > >> Is there a way to tell whether or not a node at a specific address is up >> using a SolrJ API? >> >> >> >> -- >> View this message in context: http://lucene.472066.n3. >> nabble.com/Detecting-down-node-with-SolrJ-tp4295402.html >> Sent from the Solr - User mailing list archive at Nabble.com. >>
Re: Detecting down node with SolrJ
I think it is better to use zookeeper data. Solr Cloud updates zookeeper about node status. If you are using cloud then u can check zookeeper cluster api and get status of node from there. Zookeeper cluster state api can give you information about your Solr cloud. I hope this helps. Thanks Rohit Kanchan On Fri, Sep 9, 2016 at 3:38 PM, Brent <brent.pear...@gmail.com> wrote: > Is there a way to tell whether or not a node at a specific address is up > using a SolrJ API? > > > > -- > View this message in context: http://lucene.472066.n3. > nabble.com/Detecting-down-node-with-SolrJ-tp4295402.html > Sent from the Solr - User mailing list archive at Nabble.com. >
Re: Detecting down node with SolrJ
On 9/9/2016 4:38 PM, Brent wrote:
> Is there a way to tell whether or not a node at a specific address is
> up using a SolrJ API?
Based on your other questions, I think you're running cloud. If that
assumption is correct, use the Collections API with HttpSolrClient
(instead of CloudSolrClient) to get a list of collections. Using
HttpSolrClient will direct the request to that specific server.
If it doesn't throw an exception, it's up. Here's some SolrJ code.
You're going to need some exception handling that's not included here:
RequestConfig rc =
RequestConfig.custom().setConnectTimeout(5000).setSocketTimeout(5000)
.build();
HttpClient hc =
HttpClients.custom().setDefaultRequestConfig(rc).disableAutomaticRetries().build();
SolrClient client = new
HttpSolrClient("http://server:8983/solr;, hc);
CollectionAdminRequest.List req = new CollectionAdminRequest.List();
CollectionAdminResponse response = req.process(client);
I am setting the timeouts for HttpClient to five seconds so that the
request will time out relatively quick in the case where the server
isn't up, or where it's up but not functioning correctly.
Thanks,
Shawn
Detecting down node with SolrJ
Is there a way to tell whether or not a node at a specific address is up using a SolrJ API? -- View this message in context: http://lucene.472066.n3.nabble.com/Detecting-down-node-with-SolrJ-tp4295402.html Sent from the Solr - User mailing list archive at Nabble.com.
